wEyodsTjUtDbb8A652Dh/ZPwLoZKAA9N20T5hiUNtGFxnSRWh9xB1WIAwtnz9FDLsT73PiiPyiBLhmI511cyAC+upKqKCtk7OR0fHzlRaH/h7H71X4PAxxes0xYLuEaPwNcanLSB1Tb5e84/JqrZhSqkIxaV5CgNVlRwiU7V5WM=AQAB","PublicKeyExpiration":"2019-12-20T16:49:17","code":0,"msg":"OK","ResponseCode":"","ResponseText":"","timeStamp":"2019-12-10T11:49:17.6372291Z"}';
$response = json_decode($json);
$signature = md5("5aafc741ff855d9e".strtolower("Tools/SubscriberCampaignActivation"));
$rsa = new RSA();
$rsa->loadKey($response['PublicKey'], RSA::PUBLIC_FORMAT_XML);
$ciphertext = $rsa->encrypt($signature);
$byte_array = unpack('C*', $ciphertext);
$length = count($byte_array);
// return $length;
$i = 0;
$sb = '';
foreach ($byte_array as $x) {
$i++;
// sb.Append(x);
$sb .= $x;
if ($i < $length)
$sb .= ',';
}
// $result = implode(',', $byte_array);
return $sb;
print_r($response);